package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;
import util.Page;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

//注解
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        req.setCharacterEncoding("utf-8");
        String action=req.getParameter("action");
        if("list".equals(action))
        {
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            String currentPage=req.getParameter("CurrentPage");
            if(currentPage==null)
            {
                currentPage="1";
            }
            int int_currentPage=Integer.parseInt(currentPage);
            User condition=new User(name,pass);
            //计算偏移量
            Page page=new Page();
            int pageSize=page.getPageSize();
            int offset=(int_currentPage-1)*pageSize;
            page.setCurrentPage(int_currentPage);
            //计算总记录数
            int Count=userService.count(condition);
            page.setTotalCount(Count);
            page.setTotalPage();
            List<User> users = userService.findAll(condition,offset,pageSize);
            //存储对象到作用域中
            req.setAttribute("page", page);
            req.setAttribute("users", users);
            req.setAttribute("user", condition);
            //跳转到对应的视图显示数据
            req.getRequestDispatcher("/index.jsp").forward(req, resp);
        }
        else if("delete".equals(action))
        {
            //拿到网页传过来的用户密码
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            int result= userService.deleteUser(id);
            if(result>0) {
                resp.sendRedirect("user?action=list");
            }
        }
        else if ("add".equals(action)) {
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result= userService.addUser(new User (name,pass));
            if(result>0) {
                resp.sendRedirect("user?action=list");
            }
        }
        else if ("toUpdate".equals(action)) {
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            User user= userService.findUserById(id);
            //存储对象到作用域中
            req.setAttribute("user", user);
            //跳转到对应的视图显示数据
            req.getRequestDispatcher("/update.jsp").forward(req, resp);
        }
        else if ("update".equals(action)){
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result= userService.updateUser(new User (id,name,pass));
            if(result>0) {
                resp.sendRedirect("user?action=list");
            }
        }
    }
}
